hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures a distribute-list on an…
An engineer configures a distribute-list on an OSPF router to filter routes. However, the routes are still being advertised to neighbors. Which is the most likely explanation?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The distribute-list filters routes in the routing table, not the LSAs sent in OSPF updates.
A distribute-list in OSPF filters routes in the inbound or outbound direction of the routing table, but it does not filter the actual LSA advertisements. OSPF uses LSAs to propagate routes; filtering with distribute-list only affects the local routing table, not the LSAs sent to neighbors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The distribute-list filters routes in the routing table, not the LSAs sent in OSPF updates.
Why this is correct
Distribute-lists in OSPF only control which routes are installed in the local routing table, not which LSAs are advertised.
- ✗
The distribute-list is applied to the wrong interface.
Why it's wrong here
Even if applied correctly, distribute-lists do not filter LSAs.
- ✗
The distribute-list uses an incorrect prefix-list.
Why it's wrong here
The prefix-list may be correct, but distribute-lists do not filter LSAs.
- ✗
The OSPF process needs to be restarted for the distribute-list to take effect.
Why it's wrong here
Restarting OSPF would not change the behavior; distribute-lists do not filter LSAs.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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